This retrospective review analyzed 31,516 knee arthroscopies from 136 surgeons (1991–1995) to characterize the prevalence, grade, and location of hyaline cartilage lesions. It uses a modified Outerbridge scale and asks: how many patients actually have the kind of lesion that emerging cartilage grafting techniques could treat?
Cartilage restoration procedures had early promise but lacked an epidemiologic rationale for patient selection. This paper provided the first large-scale map of chondral injury patterns at arthroscopy, defining who actually has the lesion type these techniques were designed to treat.
When you scope a knee and find a Grade IV defect in a patient under 40, the medial femoral condyle is the most likely location — and that patient represents roughly 1 in 20 of all knees you will scope. Before offering cartilage restoration, recognize that nearly two-thirds of these patients will have concurrent meniscal or ligamentous pathology that must be addressed. Isolated cartilage damage is the minority.
This dataset directly shaped the indications for autologous chondrocyte implantation and osteochondral grafting in the 1990s and remains the foundational reference for understanding chondral injury epidemiology in clinical practice.
This retrospective review analyzed 31,516 knee arthroscopies from 136 surgeons (1991–1995) to characterize the prevalence, grade, and location of hyaline cartilage lesions. It uses a modified Outerbridge scale and asks: how many patients actually have the kind of lesion that emerging cartilage grafting techniques could treat?
Cartilage restoration procedures had early promise but lacked an epidemiologic rationale for patient selection. This paper provided the first large-scale map of chondral injury patterns at arthroscopy, defining who actually has the lesion type these techniques were designed to treat.
When you scope a knee and find a Grade IV defect in a patient under 40, the medial femoral condyle is the most likely location — and that patient represents roughly 1 in 20 of all knees you will scope. Before offering cartilage restoration, recognize that nearly two-thirds of these patients will have concurrent meniscal or ligamentous pathology that must be addressed. Isolated cartilage damage is the minority.
This dataset directly shaped the indications for autologous chondrocyte implantation and osteochondral grafting in the 1990s and remains the foundational reference for understanding chondral injury epidemiology in clinical practice.